Control method for coordinating wind turbine speed and power above the rated wind speed

Abstract

The invention discloses a control method for coordinating the rotating speed and the power of a wind driven generator at the wind speed higher than a rated wind speed. The method includes the steps that a real-time wind speed value at the current moment is obtained, recorded and stored; a wind speed variance value in a set time period before the current moment is calculated; the wind speed variance value is compared with a set threshold value, and the wind conditions of work of a draught fan at the current moment are adjusted according to comparison results; if the wind speed variance value is larger than the set threshold value, the draught fan is in a wind speed fluctuation area, and otherwise, the draught fan is in a smooth wind speed area; and control strategies of a converter are determined according to the wind conditions, when the draught fan is in the wind speed fluctuation area, maximum wind energy tracking control is adopted for the converter so as to reduce the rotating speed of the wind driven generator, and when the draught fan is in the smooth wind speed area, smooth power tracking control is adopted for the converter so as to guarantee smooth output of the power. According to the method, a link for judging wind speed fluctuation situations is added on the basis of a traditional smooth power algorithm, and integrated optimum of the rotating speed and the output power of the generator is achieved.

Description

technical field [0001] The invention relates to a method for controlling a wind power generator above a rated wind speed, belonging to the field of motor control. Background technique [0002] The increasingly severe energy supply and global warming have caused countries to reflect deeply on the way energy is used. With the continuous attention of the whole society to energy and environmental issues, the development of clean and renewable energy, such as wind energy, solar energy, biomass energy, etc. has become the general trend. Among them, wind energy is an inexhaustible green energy that can be used in large quantities by human beings. The main way to utilize wind energy is wind power generation, and a wind power generation system is a device that converts wind energy into electrical energy. The output power of the wind power generation system changes with the change of the external wind speed. Since the fluctuation of the wind speed will cause the fluctuation of the p...

AI Technical Summary

Problems solved by technology

[0003] The traditional wind turbine smooth power control strategy only focuses on limiting the power to the rated value and smoothing the output when the wind speed is above the rated wind speed, without considering the limitation of the speed of the wind turbine, so the actual application will cause the speed of the wind turbine to be far away. Exceeding the rated value will cause considerable mechanical stress and reduce the service life of the fan

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